JavaScript - How to remove all letters from an array of arrays

Question

I'm new on JavaScript and I'm trying to remove an array of the array if there is a letter

Ex: [["x","y", 2],[2, 4],[5, 3],[6, 9],["a", 1]]

The expected output would be: [[2, 4],[5, 3],[6, 9]];

Answer 1

In your case I think the problem is inner loop. Because data[i][j] will "x","y",2,4,5... and you can't apply indexOf() to numbers so it throws error.

You can use use Array.prototype.every() inside Array.prototype.filter()

var data = [["y","x",2],[2, 4],[5, 3],[6, 9]]
let res = data.filter(x => x.every(x =>!isNaN(x)));
console.log(res)